Audio video transport working group
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Audio/Video Transport Working Group. 47th IETF, Adelaide 29-30 March 2000 Stephen Casner -- Cisco Systems Colin Perkins -- UCL Mailing list: rem-conf[-request]@es.net. Wednesday Agenda. Introduction and document status 5 RTP spec and profile advancement20

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Audio/Video Transport Working Group

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Audio video transport working group

Audio/Video TransportWorking Group

47th IETF, Adelaide

29-30 March 2000

Stephen Casner -- Cisco Systems

Colin Perkins -- UCL

Mailing list: rem-conf[-request]@es.net


Wednesday agenda

Wednesday Agenda

  • Introduction and document status5

    • RTP spec and profile advancement20

    • Payload format for Comfort Noise10

  • RTP retransmission

    • RTCP reporting extensions5

    • RTCP-based retransmission15

    • Payload format for selective retrans.15

  • Header compression/multiplexing

    • CRTP extensions15

    • Multiplexing with tunneled CRTP10

    • CRTP+MPLS compression5

  • Authentication5


Thursday agenda

Thursday Agenda

  • G.722.1 payload format5

  • AMR payload format10

  • DV video, DV audio15

  • HDTV and AC3 payload format10

  • Loss-tolerant MP310

  • MPEG 2 Transport Stream10

  • Transport of MPEG-4

    • Elementary stream payload format15

    • Generic, error resilient payload format15

  • Charter bashing10


Rtp drafts in process

RTP Drafts in Process

  • RFCs recently published:

    • FEC payload format (RFC 2733)

      • MIME registration draft-ietf-avt-fecmime-01.txt

    • Payload format guidelines (RFC 2736)

    • SSRC Sampling (RFC 2762)

  • Drafts at IESG awaiting publication:

    • RTP MIB

    • DTMF tones payload format

    • Pointer payload format


Companion drafts for rtp spec

Companion Drafts for RTP Spec

  • MIME reg., RTCP bw specs – Proposed

    • draft-ietf-avt-rtp-mime-02.txt - added L16 preemphasis

    • draft-ietf-avt-rtcp-bw-01.txt - just version increment

  • RTP interoperability statement

    • draft-ietf-avt-rtp-interop-02.txt

    • draft-ietf-avt-profile-interop-00.txt

  • RTP/RTCP testing, scalability – Inform.

    • draft-ietf-avt-rtptest-02.txt


Status of rtp

Status of RTP

  • WG Last Call completed in DC with agreed set of edits, done in January

    • Spec is draft-ietf-avt-rtp-new-06.ps,txt

    • Profile is draft-ietf-avt-profile-new-08.ps,txt

  • AD was not able to start the review

  • A few small changes based on email

    • Spec is draft-ietf-avt-rtp-new-07.ps,txt

  • Received changes from ITU for G.729, G.723.1 to go in profile


Audio video transport working group

But...

  • We have not yet completed the interop matrix; any functions not implemented would have to be removed

  • At TSV directorate dinner, an additional concern was raised: congestion control


Congestion control in rtp

Congestion Control in RTP

IESG: Other protocols are required to have congestion control, why not RTP?

  • Applies to unicast, but perhaps not multicast

  • Just an applicability statement?

    • If you don’t do CC, the network will bite you

    • Establish a loss threshold based on TCP CC equivalence function, adapt/stop when exceeded

      • Need to know RTT, and loss pattern over RTT

      • Is RTCP feedback sufficient?

  • Defer this issue to the profile, app stmt there


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